Optical Spectroscopy of Two ISO Selected Chamaeleon i Young Stars

M. GÓMEZ, P. PERSI, G. RACCA

Córdoba

Congreso; X Reunion Regional Latinoamericana de Astronomia; 2001

IAU

We present optical spectra of ISO-ChaI 126 and ISO-ChaI 237, two ISOCAM detected candidate young stellar objects in the Chamaeleon I dark cloud (Persi et al. 2000, A&A 357, 219). Both stars were also selected by Cambrésy et al. (1998, A&A 338, 977) based on IJKs data. Our spectra were obtained  at the CASLEO (San Juan, Argentina) using the REOSC spectrograph in the SD mode. The spectrum of ISO-ChaI 126 shows a veiled continuum as well as many emission lines. In particular, Halpha, Hbeta and [O I] 6300 Amstrongs are very remarkable. Halpha has an equivalent width of 98 Amstrongs. Thisspectrum confirms the pre-main sequence nature of this object and allows us to classify this star as a CTTS (classical T Tauri star). For ISO-ChaI 237, Halpha is clearly visible with an equivalent width of 1.5 Amstrongs. However, no Li I 6707 Amstrongs is undoubtedly present in our poor S/N data. Additional observations are required to certainly classify this object. Based on the current Halpha detection and the measured equivalent width we tentatively classify this star as a WTTS (weak emission T Tauri star).